diff --git a/lib/docsify.js b/lib/docsify.js
index d28abf5f..b6cac80f 100644
--- a/lib/docsify.js
+++ b/lib/docsify.js
@@ -130,7 +130,10 @@ function scrollActiveSidebar () {
     var li = lis[i];
     var href = li.querySelector('a').getAttribute('href');
 
-    if (href !== '/') { href = href.match(/#([^#]+)$/g)[0].slice(1); }
+    if (href !== '/') {
+      var match = href.match('#([^#]+)$');
+      if (match && match.length) { href = match[0].slice(1); }
+    }
 
     nav[decodeURIComponent(href)] = li;
   }
@@ -174,19 +177,23 @@ function activeLink (dom, activeParent) {
   var host = window.location.href;
 
   dom = typeof dom === 'object' ? dom : document.querySelector(dom);
-  if (!dom) { return
+  if (!dom) { return }
+  var target;[].slice.call(dom.querySelectorAll('a'))
+    .sort(function (a, b) { return b.href.length - a.href.length; })
+    .forEach(function (node) {
+      if (host.indexOf(node.href) === 0 && !target) {
+        activeParent
+          ? node.parentNode.setAttribute('class', 'active')
+          : node.setAttribute('class', 'active');
+        target = node;
+      } else {
+        activeParent
+          ? node.parentNode.removeAttribute('class')
+          : node.removeAttribute('class');
+      }
+    });
 
-  ; }[].slice.call(dom.querySelectorAll('a')).forEach(function (node) {
-    if (node.href === host) {
-      activeParent
-        ? node.parentNode.setAttribute('class', 'active')
-        : node.setAttribute('class', 'active');
-    } else {
-      activeParent
-        ? node.parentNode.removeAttribute('class')
-        : node.removeAttribute('class');
-    }
-  });
+  return target
 }
 
 /**
@@ -2348,7 +2355,7 @@ function cover () {
   var SL = ', 100%, 85%';
   var bgc = "linear-gradient(to left bottom, hsl(" + (Math.floor(Math.random() * 255) + SL) + ") 0%, hsl(" + (Math.floor(Math.random() * 255) + SL) + ") 100%)";
 
-  return ("<section class=\"cover\" style=\"background: " + bgc + "\">\n    <div class=\"cover-main\"></div>\n  </section>")
+  return ("<section class=\"cover\" style=\"background: " + bgc + "\">\n    <div class=\"cover-main\"></div>\n    <div class=\"mask\"></div>\n  </section>")
 }
 
 function toggle () {
@@ -2452,12 +2459,12 @@ function renderApp (dom, replace) {
  */
 function renderArticle (content) {
   renderTo('article', content ? marked(content) : 'not found');
-  if (!renderSidebar.rendered) { renderSidebar(null, OPTIONS$1); }
-  if (!renderNavbar.rendered) { renderNavbar(null, OPTIONS$1); }
-  renderSidebar.rendered = false;
-  renderNavbar.rendered = false;
+  if (!OPTIONS$1.sidebar && !OPTIONS$1.loadSidebar) { renderSidebar(); }
 
-  if (content && typeof Vue !== 'undefined' && typeof Vuep !== 'undefined') { new Vue({ el: 'main' }); } // eslint-disable-line
+  if (content && typeof Vue !== 'undefined' && typeof Vuep !== 'undefined') {
+    var vm = new Vue({ el: 'main' }); // eslint-disable-line
+    vm.$nextTick(function (_) { return scrollActiveSidebar(); });
+  }
   if (OPTIONS$1.auto2top) { scroll2Top(); }
 }
 
@@ -2467,7 +2474,6 @@ function renderArticle (content) {
 function renderNavbar (content) {
   if (CACHE.navbar && CACHE.navbar === content) { return }
   CACHE.navbar = content;
-  renderNavbar.rendered = true;
 
   if (content) { renderTo('nav', marked(content)); }
   activeLink('nav');
@@ -2477,23 +2483,27 @@ function renderNavbar (content) {
  * sidebar
  */
 function renderSidebar (content) {
-  var isToc = false;
+  var html;
 
   if (content) {
-    content = marked(content);
+    html = marked(content);
   } else if (OPTIONS$1.sidebar) {
-    content = tree(OPTIONS$1.sidebar, '<ul>');
+    html = tree(OPTIONS$1.sidebar, '<ul>');
   } else {
-    content = tree(genTree(toc, OPTIONS$1.maxLevel), '<ul>');
-    isToc = true;
+    html = tree(genTree(toc, OPTIONS$1.maxLevel), '<ul>');
   }
 
-  renderSidebar.rendered = true;
-  if (CACHE.sidebar && CACHE.sidebar === content) { return }
-  CACHE.sidebar = content;
-  renderTo('aside.sidebar', content);
-  if (isToc) { scrollActiveSidebar(); }
+  renderTo('aside.sidebar', html);
+  var target = activeLink('aside.sidebar', true);
+  if (content) { renderSubSidebar(target); }
   toc = [];
+
+  scrollActiveSidebar();
+}
+
+function renderSubSidebar (target) {
+  if (!OPTIONS$1.subMaxLevel) { return }
+  target.parentNode.innerHTML += tree(genTree(toc, OPTIONS$1.subMaxLevel), '<ul>');
 }
 
 /**
@@ -2502,12 +2512,31 @@ function renderSidebar (content) {
 function renderCover (content) {
   renderCover.dom = renderCover.dom || document.querySelector('section.cover');
   if (!content) {
-    renderCover.dom.classList.add('hidden');
-  } else {
-    renderCover.dom.classList.remove('hidden');
-    !renderCover.rendered && renderTo('.cover-main', marked(content));
-    renderCover.rendered = true;
+    renderCover.dom.classList.remove('show');
+    return
   }
+  renderCover.dom.classList.add('show');
+  if (renderCover.rendered) { return }
+
+  // render cover
+  var html = marked(content);
+  var match = html.trim().match('<p><img[^s]+src="(.*?)"[^a]+alt="(.*?)"></p>$');
+
+  // render background
+  if (match) {
+    var coverEl = document.querySelector('section.cover');
+
+    if (match[2] === 'color') {
+      coverEl.style.background = match[1];
+    } else {
+      coverEl.classList.add('has-mask');
+      coverEl.style.backgroundImage = "url(" + (match[1]) + ")";
+    }
+    html = html.replace(match[0], '');
+  }
+
+  renderTo('.cover-main', html);
+  renderCover.rendered = true;
 
   sticky();
 }
@@ -2561,6 +2590,7 @@ var OPTIONS = {
   el: '#app',
   repo: '',
   maxLevel: 6,
+  subMaxLevel: 0,
   sidebar: '',
   sidebarToggle: false,
   loadSidebar: null,
@@ -2595,7 +2625,6 @@ var mainRender = function (cb) {
   var route = OPTIONS.basePath + getRoute();
   if (cacheRoute === route) { return cb() }
 
-  var wait;
   var basePath = cacheRoute = route;
 
   if (!/\//.test(basePath)) {
@@ -2627,22 +2656,16 @@ var mainRender = function (cb) {
     if (OPTIONS.coverpage && page !== OPTIONS.homepage) { renderCover(); }
     // render sidebar
     if (OPTIONS.loadSidebar) {
-      if (wait === false) { cb(); }
-      wait = false;
+      load(basePath + OPTIONS.loadSidebar)
+        .then(function (result) {
+          renderSidebar(result);
+          cb();
+        });
     } else {
       cb();
     }
   }, function (_) { return renderArticle(null); });
 
-  // Render sidebar
-  if (OPTIONS.loadSidebar) {
-    load(basePath + OPTIONS.loadSidebar).then(function (result) {
-      renderSidebar(result);
-      if (wait === false) { cb(); }
-      wait = false;
-    });
-  }
-
   // Render navbar
   if (OPTIONS.loadNavbar) {
     load(basePath + OPTIONS.loadNavbar).then(renderNavbar);
@@ -2653,10 +2676,7 @@ var Docsify = function () {
   var dom = document.querySelector(OPTIONS.el) || document.body;
   var replace = dom !== document.body;
   var main = function () {
-    mainRender(function (_) {
-      activeLink('aside.sidebar', true);
-      scrollIntoView();
-    });
+    mainRender(function (_) { return scrollIntoView(); });
   };
 
   // Render app
diff --git a/lib/docsify.min.js b/lib/docsify.min.js
index d5da465e..e98b3264 100644
--- a/lib/docsify.min.js
+++ b/lib/docsify.min.js
@@ -1,2 +1,2 @@
-var Docsify=function(){"use strict";function e(e,t,n){void 0===t&&(t="GET");var r=new XMLHttpRequest;return r.open(t,e),r.send(),{then:function(e,t){if(void 0===t&&(t=function(){}),n){var i=setInterval(function(e){return n({step:Math.floor(5*Math.random()+1)})},500);r.addEventListener("progress",n),r.addEventListener("loadend",function(e){n(e),clearInterval(i)})}r.addEventListener("error",t),r.addEventListener("load",function(n){var r=n.target;r.status>=400?t(r):e(r.response)})},abort:function(){return 4!==r.readyState&&r.abort()}}}function t(e,t){var n=[],r={};return e.forEach(function(e){var i=e.level||1,a=i-1;i>t||(r[a]?(r[a].children=r[a].children||[],r[a].children.push(e)):n.push(e),r[i]=e)}),n}function n(e){return e.replace(/([A-Z])/g,function(e){return"-"+e.toLowerCase()})}function r(e){return null===e||void 0===e}function i(){var e=window.location;if(A===e.hash&&!r(C))return C;var t=e.hash.match(/^#\/([^#]+)/);return t=t&&2===t.length?t[1]:/^#\//.test(e.hash)?"":e.pathname,C=t,A=e.hash,t}function a(){return document.body.clientWidth<=600}function s(){function e(){for(var e=0,r=t.length;e<r;e+=1){var a=t[e],s=a.getBoundingClientRect();if(s.top<10&&s.bottom>10){var o=n[a.getAttribute("data-id")];if(!o||o===i)return;return i&&i.setAttribute("class",""),o.setAttribute("class","active"),void(i=o)}}}if(!a()){for(var t=document.querySelectorAll(".anchor"),n={},r=document.querySelectorAll(".sidebar li"),i=null,s=0,o=r.length;s<o;s+=1){var l=r[s],u=l.querySelector("a").getAttribute("href");"/"!==u&&(u=u.match(/#([^#]+)$/g)[0].slice(1)),n[decodeURIComponent(u)]=l}window.removeEventListener("scroll",e),window.addEventListener("scroll",e),e()}}function o(){var e=window.location.hash.match(/#[^#\/]+$/g);if(e&&e.length){var t=document.querySelector(decodeURIComponent(e[0]));t&&t.scrollIntoView()}}function l(e,t){var n=window.location.href;e="object"==typeof e?e:document.querySelector(e),e&&[].slice.call(e.querySelectorAll("a")).forEach(function(e){e.href===n?t?e.parentNode.setAttribute("class","active"):e.setAttribute("class","active"):t?e.parentNode.removeAttribute("class"):e.removeAttribute("class")})}function u(e){if(e="object"==typeof e?e:document.querySelector(e)){var t=document.body;e.addEventListener("click",function(){return t.classList.toggle("close")}),/mobile/i.test(navigator.userAgent)&&document.querySelector("aside").addEventListener("click",function(e){t.classList.toggle("close")})}}function c(){if(!_){var e=a()?"body":"section.content";_=document.querySelector(e)}_.scrollTop=0}function d(){var e=document.querySelector("section.cover"),t=e.getBoundingClientRect().height;return function(){window.pageYOffset>=t||e.classList.contains("hidden")?document.body.classList.add("sticky"):document.body.classList.remove("sticky")}()}function p(e,t){return t={exports:{}},e(t,t.exports),t.exports}function g(e){return e?(/\/\//.test(e)||(e="https://github.com/"+e),e=e.replace(/^git\+/,""),'\n  <a href="'+e+'" class="github-corner" aria-label="View source on Github">\n    <svg viewBox="0 0 250 250" aria-hidden="true">\n      <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>\n      <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>\n      <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 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diff --git a/lib/themes/buble.css b/lib/themes/buble.css
index da2fa6e3..0ba26bb6 100644
--- a/lib/themes/buble.css
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diff --git a/lib/themes/vue.css b/lib/themes/vue.css
index 6f9e14c9..9b00a51e 100644
--- a/lib/themes/vue.css
+++ b/lib/themes/vue.css
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